Signs, Symptoms, and Complications - Atrial Fibrillation - Signs, Symptoms, and Complications

You may or may not notice atrial fibrillation. It often occurs with no signs or symptoms. If you do have symptoms, you may notice something that occurs only occasionally. Or, your symptoms may be frequent or serious. If you have heart disease that is worsening, you may notice more symptoms of atrial fibrillation. If your atrial fibrillation is undetected or left untreated, serious and even life-threatening complications can arise. They include stroke and heart failure.